Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull  more i2c updates from Wolfram Sang:

 - make Lenovo Yoga C630 boot now that the dependencies are merged

 - restore BlockProcessCall for i801, accidently removed in this merge
   window

 - a bugfix for the riic driver

 - an improvement to the slave-eeprom driver which should have been in
   the first pull request but sadly got lost in the process

* 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: slave-eeprom: Add read only mode
  i2c: i801: Bring back Block Process Call support for certain platforms
  i2c: riic: Clear NACK in tend isr
  i2c: qcom-geni: Disable DMA processing on the Lenovo Yoga C630

Author: torvalds

drivers/i2c/busses/i2c-i801.c

@@ -1736,6 +1736,7 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	case PCI_DEVICE_ID_INTEL_LEWISBURG_SSKU_SMBUS:
 	case PCI_DEVICE_ID_INTEL_DNV_SMBUS:
 	case PCI_DEVICE_ID_INTEL_KABYLAKE_PCH_H_SMBUS:
+		priv->features |= FEATURE_BLOCK_PROC;
 		priv->features |= FEATURE_I2C_BLOCK_READ;
 		priv->features |= FEATURE_IRQ;
 		priv->features |= FEATURE_SMBUS_PEC;

drivers/i2c/busses/i2c-qcom-geni.c

@@ -355,11 +355,13 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
 {
 	dma_addr_t rx_dma;
 	unsigned long time_left;
-	void *dma_buf;
+	void *dma_buf = NULL;
 	struct geni_se *se = &gi2c->se;
 	size_t len = msg->len;
 
-	dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
+	if (!of_machine_is_compatible("lenovo,yoga-c630"))
+		dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
+
 	if (dma_buf)
 		geni_se_select_mode(se, GENI_SE_DMA);
 	else
@@ -394,11 +396,13 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
 {
 	dma_addr_t tx_dma;
 	unsigned long time_left;
-	void *dma_buf;
+	void *dma_buf = NULL;
 	struct geni_se *se = &gi2c->se;
 	size_t len = msg->len;
 
-	dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
+	if (!of_machine_is_compatible("lenovo,yoga-c630"))
+		dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
+
 	if (dma_buf)
 		geni_se_select_mode(se, GENI_SE_DMA);
 	else

drivers/i2c/busses/i2c-riic.c

@@ -202,6 +202,7 @@ static irqreturn_t riic_tend_isr(int irq, void *data)
 	if (readb(riic->base + RIIC_ICSR2) & ICSR2_NACKF) {
 		/* We got a NACKIE */
 		readb(riic->base + RIIC_ICDRR);	/* dummy read */
+		riic_clear_set_bit(riic, ICSR2_NACKF, 0, RIIC_ICSR2);
 		riic->err = -ENXIO;
 	} else if (riic->bytes_left) {
 		return IRQ_NONE;

drivers/i2c/i2c-slave-eeprom.c

@@ -33,11 +33,13 @@ struct eeprom_data {
 	u16 address_mask;
 	u8 num_address_bytes;
 	u8 idx_write_cnt;
+	bool read_only;
 	u8 buffer[];
 };
 
 #define I2C_SLAVE_BYTELEN GENMASK(15, 0)
 #define I2C_SLAVE_FLAG_ADDR16 BIT(16)
+#define I2C_SLAVE_FLAG_RO BIT(17)
 #define I2C_SLAVE_DEVICE_MAGIC(_len, _flags) ((_flags) | (_len))
 
 static int i2c_slave_eeprom_slave_cb(struct i2c_client *client,
@@ -53,9 +55,11 @@ static int i2c_slave_eeprom_slave_cb(struct i2c_client *client,
 			eeprom->buffer_idx = *val | (eeprom->buffer_idx << 8);
 			eeprom->idx_write_cnt++;
 		} else {
-			spin_lock(&eeprom->buffer_lock);
-			eeprom->buffer[eeprom->buffer_idx++ & eeprom->address_mask] = *val;
-			spin_unlock(&eeprom->buffer_lock);
+			if (!eeprom->read_only) {
+				spin_lock(&eeprom->buffer_lock);
+				eeprom->buffer[eeprom->buffer_idx++ & eeprom->address_mask] = *val;
+				spin_unlock(&eeprom->buffer_lock);
+			}
 		}
 		break;
 
@@ -130,6 +134,7 @@ static int i2c_slave_eeprom_probe(struct i2c_client *client, const struct i2c_de
 	eeprom->idx_write_cnt = 0;
 	eeprom->num_address_bytes = flag_addr16 ? 2 : 1;
 	eeprom->address_mask = size - 1;
+	eeprom->read_only = FIELD_GET(I2C_SLAVE_FLAG_RO, id->driver_data);
 	spin_lock_init(&eeprom->buffer_lock);
 	i2c_set_clientdata(client, eeprom);
 
@@ -165,8 +170,11 @@ static int i2c_slave_eeprom_remove(struct i2c_client *client)
 
 static const struct i2c_device_id i2c_slave_eeprom_id[] = {
 	{ "slave-24c02", I2C_SLAVE_DEVICE_MAGIC(2048 / 8,  0) },
+	{ "slave-24c02ro", I2C_SLAVE_DEVICE_MAGIC(2048 / 8,  I2C_SLAVE_FLAG_RO) },
 	{ "slave-24c32", I2C_SLAVE_DEVICE_MAGIC(32768 / 8, I2C_SLAVE_FLAG_ADDR16) },
+	{ "slave-24c32ro", I2C_SLAVE_DEVICE_MAGIC(32768 / 8, I2C_SLAVE_FLAG_ADDR16 | I2C_SLAVE_FLAG_RO) },
 	{ "slave-24c64", I2C_SLAVE_DEVICE_MAGIC(65536 / 8, I2C_SLAVE_FLAG_ADDR16) },
+	{ "slave-24c64ro", I2C_SLAVE_DEVICE_MAGIC(65536 / 8, I2C_SLAVE_FLAG_ADDR16 | I2C_SLAVE_FLAG_RO) },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, i2c_slave_eeprom_id);